From a reader:

Dear Jonah,
Several years ago I read a story in Popular Science about putting wind
farms in skyscrapers. The plan was to put them on a floor about half way up
the building. The wind that is redirected by the building being there would
funnel through this area and spin the turbines. What ever happened to this
idea?
As someone who works in Chicago, and almost been blown over a few times, I
think this is a great idea! A better idea would be to harness the wind that
gave Chicago it’s nickname. Talk about cheap, abundant energy! Set up the
turbines, say O’Hare expansion, and get ready for a lifetime of FREE
energy!